During host Andy Cohen's 60-second speed round of questions about Graham's past roommate, she also joked that Britton, 46, would leave the dishes in the sink "forever" and would secretly borrow her shoes.

But the actress wouldn't air too much of her dirty laundry. When asked what Britton's dirtiest habit was, Graham said, "She didn't have any. What a breath of fresh air all the time!" How often did Britton bring guys home? "Just as often as I did," she joked.

Graham, who was promoting her upcoming debut novel, "Someday, Someday, Maybe," also discussed the possibility of a "Gilmore Girls" movie. "I wish that I could answer this in a more satisfying way, because I get asked it all the time. The 'Veronica Mars' movie got this all started with the Kickstarter thing, but without knowing what the creator of the show wants to do exactly, I don't know."

The CW series, co-starring Alexis Bledel, came to an end in 2007 after seven seasons. Was Graham happy with how it ended? Well ...

"I feel like we did the best we could without the original creator [Amy Sherman-Palladino] of the show, but it would have been different with her," Graham explained. Palladino left the show in 2006 over contract disputes. "It was good, but I understand why it wasn't satisfying for people."